At least 8 people are dead and more than a dozen have been injured after a police chopper crashed into the roof of a crowded pub in Glasgow, Scotland. NBC’s Anabell Roberts reports.

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>>>good evening.
police helicopters
buzzing overhead are ubiquitous from the skies over many
big cities
here and abroad that they are barely noticed. no one expected the awful tragedy that happened last night in the center of scotland's biggest city when a police chopper came crashing down on the roof of a crowded pub. at least eight people are dead, more than a dozen hurt. tonight just over
24 hours
later, searchers are working their way through the wreckage, trying to account for all of those inside. a process officials say could take days. it happened at a riverfront pub in
glasgow
. that's where annabell roberts is tonight with the latest on the unfolding disaster.

>> reporter: the
police helicopter
lies broken, embedded on the roof of the pub. when it hit, more than a hundred people were inside this
popular music
venue in the center of
glasgow
, listening to a band, enjoying a night out. eyewitnesses describe the engine sputtering before the chopper fell.

>>plummeted like a stone and dropped down. it was tumbling at the same time.

>> reporter: part of the roof collapsed ending up huge clouds of choking dust.

>>there was a whooshing sound. the came straight up and the whole roof just caved in.

>>it was like a
mushroom cloud
. it just enveloped everybody with dust. it was horrific.

>> reporter: police confirmed the pilot and two
police officers
traveling in the chopper were killed. five more bodies have been found inside the building.

>>this is a complex and ongoing
rescue operation
. it will not be a quick operation. this is a very complicated and, indeed, dangerous scene.

>> reporter: the search continues. officials say the site is too dangerous to know for sure if more people are trapped. when celebrations are normally held to honor scotland's
patron saint
but today they mourn. a special mass has been held. in a statement the queen said her thoughts and prayers are with the victims. 14 people remain in hospitals across this city tonight being treated for very serious injuries. meanwhile both the police and the company that built the helicopter have launched investigations into this fatal accident. lester?